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United States Patent | 5,341,776 |
Phelps | August 30, 1994 |
A closed loop fuel supply system for operating engines in all possible attitudes in which fuel is delivered by a vacuum pump responsive to the vacuum level in the crank case of the engine and in which the vacuum driving the pump is modulated in response to the pressure of fuel being delivered to the fuel supply system so that the amount of fuel delivered for combustion purposes is equal to the requirements of the engine without any excess so that a fuel return line is not required.
Inventors: | Phelps; Harold E. (1845 B Franciscan Ter., Winston Salem, NC 27127) |
Appl. No.: | 089483 |
Filed: | July 12, 1993 |
Current U.S. Class: | 123/73C; 123/DIG.5; 261/35; 261/41.1; 417/395 |
Intern'l Class: | F02B 033/04 |
Field of Search: | 123/73 C,DIG. 5,387 417/380,395 261/35,41.1,41.5 |
2969963 | Jan., 1961 | Brown | 123/DIG. |
4552101 | Nov., 1985 | Borst et al. | 123/DIG. |
4903655 | Feb., 1990 | Vonderau et al. | 123/DIG. |